The students of Chestnut Tree Prep always earned low grades in mathematics. The administration looked into the matter and found out that although the handouts given by the teacher were extremely good, the teacher was unable to convey the steps and procedures involved in lectures and discussions. The teacher demonstrated .

high ability in written expression and low ability in oral expression

Explanation:

For the teacher to prepare good handout for the students shows that, he has a HIGH ABILITY IN WRITTEN EXPRESSION. However, since the teacher was unable to convey the steps and procedures involved in lectures and discussions, this shows that the teacher has a LOW ABILITY IN ORAL EXPRESSION.

Hence, the correct answer is that, the teacher demonstrated, high ability in written expression and low ability in oral expression.

because the early people found out about it.

answer; all of the answers are correct;